You should follow the steps in this page: https://docs.cmsmadesimple.org/upgrading/old-versions.I think CMSMS 1.12.1 should work fine with PHP 5.6 IIRC.The need for upgrading to a version as close as possible to the latest (if not the latest) has mainly to do with the security patches done in the mean time more than anything else, although you'll benefit of increased performance and new functionality. Highly recommended!

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